Kerr-mcgee Corporation

Scripto LLC

Alan J Lane

James E Ingle

Dean A McGee

John P Pokorski

John Kirby

Wilbur L Sheffield

William A Jarvis

A mechanical pencil is disclosed that includes a barrel with a non-circular internal bore, a helical coil member that is fitted within the bore and attached to an externally positioned driving member, and a lead positioning means or pusher member that is positioned about and threadably engaged with the coil and constrained by the non-circular bore of the barrel for sliding longitudinal movement therein. The lead positioning means or pusher member includes fins that extend through the coil turns and act as a positioning stop for the writing lead and a lead gripping means for propelling and repelling the centrally disposed writing lead upon the manual rotation of the external driving member that is attached to the coil disposed within the barrel.

Disposable propel-repel pencil

An improved mining apparatus for excavating material, such as coal, for example, from an earth formation, such as a coal seam, for example, wherein a miner, having a forward and a rearward cutter, is guided through the coal seam and excavates a borehole therein, the borehole being filled with a working fluid during the operation of the miner, the working fluid facilitating the operation of the miner and providing a vehicle for removing the mined material. Substantially all of the operations of the miner are controlled from the earth's surface thereby eliminating the necessity and accompanying hazards and costs involved in utilizing personnel underground during the mining operations.

Mining apparatus

Growing community of inventors

Lexington, MA, United States of America

Alan J Lane